ts_std_dev(client_retention_rate, 90) < ts_mean(ts_std_dev(client_retention_rate, 90), 270)

ts_rank(client_retention_rate, 90) > 0.8 and ts_std_dev(client_retention_rate, 90) < ts_std_dev(client_retention_rate, 270)

group_zscore(ts_std_dev(client_retention_rate, 90), sector) < -1.0

ts_scale(client_retention_rate, 90) > 0.7 and ts_std_dev(client_retention_rate, 90) < 0.05

ts_delta(ts_std_dev(client_retention_rate, 90), 90) < 0 and ts_std_dev(client_retention_rate, 90) < ts_mean(client_retention_rate, 270) * 0.1

ts_zscore(ts_std_dev(client_retention_rate, 90), 90) < -2.0

group_neutralize(ts_std_dev(client_retention_rate, 90), industry) < 0.03

ts_decay_linear(ts_std_dev(client_retention_rate, 90), 90) < ts_decay_linear(ts_std_dev(client_retention_rate, 270), 270)

ts_count_nans(client_retention_rate, 90) == 0 and ts_std_dev(client_retention_rate, 90) < 0.02

ts_arg_min(ts_std_dev(client_retention_rate, 90), 180) < 90

ts_corr(client_retention_rate, revenue_growth, 90) > 0.6 and ts_std_dev(client_retention_rate, 90) < 0.04

ts_backfill(ts_std_dev(client_retention_rate, 90), 90, 1) < ts_mean(ts_std_dev(client_retention_rate, 90), 180)

group_scale(ts_std_dev(client_retention_rate, 90), industry) < 0.3

ts_quantile(ts_std_dev(client_retention_rate, 90), 90, "gaussian") < 0.2

ts_av_diff(ts_std_dev(client_retention_rate, 90), 90) < -0.01

ts_regression(client_retention_rate, economic_cycle_index, 90, 0, 1) > 0.5 and ts_std_dev(client_retention_rate, 90) < 0.03

ts_product(ts_std_dev(client_retention_rate, 90), 90) < 1.0e-5

ts_mean(client_retention_rate, 90) > 0.8 and ts_std_dev(client_retention_rate, 90) < 0.01

ts_step(1) % 90 == 0 and ts_std_dev(client_retention_rate, 90) < 0.02

rank(ts_std_dev(client_retention_rate, 90), 0) > 0.9 and group_zscore(ts_std_dev(client_retention_rate, 90), country) < -0.5